96 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
separate, although they may be tending toward the conditions of true subspecies 
or varieties. 
TaBLe 42.—Partula nodosa composita. Punaruu Valley. 
0 Trace. Tooth. Lanes Total. 
tooth. 
Ky eoemicarcicetard cecilia Ore 1 11 59 1 72 
TOO Sia ecretevaret vorere terete iets 0 0 35 0 35 
TOO sroty stotcraroareitek felois eiekets 1 4 72 1 78 
Totals yscsereas eee oe 2 15 166 2 185 
(1 per cent) |(8.1 per cent)/|(89.7 per cent)} (1 per cent) 
FEcunNDITY. 
: Per cent Total | Average | Average 
Group. Records. | Gravid: gravid. Eggs. Young. contents. | for gravid) for all. 
190677. eens 59 17 2.9 8 18 26 1.5 0.4 
1908 messi er rereversac 32 29 90.6 63 44 107 Sd 3.3 
1909 aeeicsteroccic 77 18 D3 42 5 47 2.6 0.6 
Ate yacreceeaetalersiens 168 64 38.1 113 67 180 2.8 foil 
HEREDITY. 
Young, 
plain. 
Adults: Plain.... 14 
Banded. . 14 
50000000000 28 
Partula nodosa leva Pilsbry.—Maruapoo Valley. 
The collections from this small gorge are of exceptional interest: (1) because 
the locality is so close to the area described by Garrett as the original home of the 
species; (2) because of Mayer’s observations in 1899, which afford a basis of com- 
parison with later studies, and (3) on account of the intrinsic peculiarities of the 
Maruapoo colony. Most of the shells are sinistral, and hence the variety of this 
region is well named /eva, although dextral examples must be included under that 
term. A similar inconsistency is obligatory in the case of dextral individuals 
belonging to var. sinistrorsa of P. otaheitana, to be described later. 
Not only is the coil predominantly reversed in this colony, but the colors are 
not identical in most cases with those of var. composita. The shells present a bewil- 
dering series of variations in this respect, wherefore it is not profitable to attempt to 
classify them, save into the two classes of “plain” and “banded.” The first class 
(figs. 14 to 16 and 20 to 28, plate 23) includes individuals like those of Classes I and 
IV of composita, but all gradations between light and dark extremes also occur in 
sufficient numbers to render the establishment of discontinuous groups impossible; 
the intermediates may exhibit a uniform ground-color, or they may have a dark 
uniform spire above a peculiarly striated basal whorl. The banded shells (figs. 17 
